FOOD SCIENCE ›› 2013, Vol. 34 ›› Issue (13): 127-131.doi: 10.7506/spkx1002-6630-201313028

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Antioxidant Activity in vitro of Polysaccharides with Different Molecular Weights from Truffles

YUE Jin-mei,PU Biao*,CHEN An-jun,LIU Xing-yan   

  1. College of Food Science, Sichuan Agricultural University, Ya’an 625014, China
  • Received:2012-04-17 Online:2013-07-15 Published:2013-06-28
  • Contact: Pu Biao E-mail:pubiao2002@yahoo.com.cn

Abstract:

Objective: To study the antioxidant activity in vitro of polysaccharides with different molecular weights
from truffles. Methods: Three polysaccharide fractions were obtained from crude polysaccharides (TIP) from truffles by
ultrafiltration centrifugation, TIP-Ⅲ (greater than 100 ku),TIP-Ⅱ(between 100 ku and 50 ku) and TIP-Ⅰ(less than 50 ku).
The antioxidant activity of the polysaccharide fractions was evaluated by reducing power, DPPH, hydroxyl, superoxide anion
radical scavenging, and Fe2+-chelating assays. Results: TIP and these polysaccharide fractions were ranked in decreasing
order: TIP-Ⅲ, TIP-Ⅱ, TIP-Ⅰand TIP by reducing power, and TIP-Ⅰ, TIP-Ⅱ, TIP-Ⅲ and TIP by Fe2+-chelating ability
with IC50 values of 2.70, 3.06, 3.91 mg/mL and 19.55 mg/mL, respectively. TIP-Ⅲ had the strongest scavenging activity
against DPPH, hydroxyl and superoxide anion radicals with IC50 values of 2.83, 1.67 mg/mL and 4.71 mg/mL, respectively.
Conclusion: All the polysaccharides with different molecular weights from truffles have antioxidant potential, which might
be closely associated with their relative molecular weight.

Key words: truffle polysaccharides, molecular weight, free radical, antioxidant activity

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